Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!zephyr.ens.tek.com!tekgen!andyd
From: andyd@tekgen.BV.TEK.COM (Andy Davidson)
Newsgroups: comp.sys.cdc
Subject: Re: CDC nostalgia
Keywords: CDC, nostalgia, 6600
Message-ID: <5730@tekgen.BV.TEK.COM>
Date: 30 Mar 90 00:45:03 GMT
References: <1990Mar28.032615.12039@ultra.com> <7496@hydra.gatech.EDU>
Reply-To: andyd@tekgen.BV.TEK.COM (Andy Davidson)
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 26

In article <7496@hydra.gatech.EDU> roy@prism.gatech.EDU (Roy Mongiovi) writes:
>I did always kind of think that B1 ought to have been one, though.
>(Or for the really old-timers, maybe that should have been B7.)

	Yeah.  More than once I remember searching for bugs in Kronos and
later in 7600 Scope 1 because some rogue program had changed B1 (or B7) from
being 1.  There were pseduo-ops if I recall correctly called B1=1 and B7=1
in COMPASS so that the assembler could use B1 (or B7) instead of having to 
use a constant 1.  This reduced many increment instructions to 15 bits instead
of 30.

	My first CDC machine was the 3600 and later the 6500 at Michigan
State between 1965 and 1969.  Much later I worked on 6600 serial 2? 4? at
LBL.

		Hi, Steve.

			andy


 Andy Davidson    Toolsmith-in-residence    Tektronix,Inc  (503) 685-3033
Internet: andyd@pogo.WV.tek.com     uucp: ...!tektronix!pogo!andyd

-- 
Andy Davidson    Toolsmith-in-residence    	(503) 685-3033
Internet: andyd@pogo.WV.tek.com     uucp: ...!tektronix!pogo!andyd